17
CHEMICAL MAINTENANCE
It is not necessary to perform regular
chemical maintenance on the Yazaki
chiller-heater itself. The chemical
balance has been established in the
factory during run testing. Normally, the
only chemical that must be maintained is
the inhibitor charge. By capturing non-
condensable gases, as shown in Fig. 12,
comparison can be made to determine if
the normal hydrogen byproduct is being
produced at anticipated rates. If more
hydrogen
is
being
produced
than
anticipated, a maintenance inhibitor
charge may need to be introduced into
the machine by the ASP. An inhibitor
charge is typically needed every three
years in Yazaki gas-fired chiller-heaters.
Fig. 12
– Capturing Gases
WINTERIZING
When equipment is located outdoors
in climates subject to freezing, cooling
water must be drained from the chiller-
heater, piping, and cooling tower at the
end of the cooling season. Use of glycol
may also be permissible. Consult the
Service Manual for details concerning
Anti-Freeze Strategies.
When draining a fluid loop, make sure
to blow through the emptied loop with
compressed air
(or similar)
. Blow in both
directions through the loop so as to blow
out as much of the residual fluid as
possible. This is to help prevent
potential tube damage during freezing
conditions.
TROUBLESHOOTING
SYMPTOM: Chiller-Heater does not operate.
Possible Cause
REMEDY
No High Voltage
Check the LED for the Power indication on the Control Panel. If it is not illuminated, check the
main power disconnect, fuses, and breakers.
Solution Pump Not Running
Check for illumination of the "FAILURE" LED in the row of indicator LEDs for the Solution
Pump. If lit, check the VFD Controller.
Manual Reset Device Tripped
Check the error codes using the display on the front panel or the ACT5 Maintenance Checker
to identify which device is tripped.
Unit Overheated
Check combustion, gas pressure, and vent assembly for conditions that cause over-firing or
prevent proper venting. Check the VFD controller for the Solution Pump. Improper mass flow
through the machine can cause overheating symptoms.
SYMPTOM: Poor cooling capacity.
Possible Cause
REMEDY
Poor Vacuum
Evacuate the machine per normal maintenance procedure.
High Inlet Cooling Water
Temperature
Check the cooling tower fan. Check the cooling tower fluid level.
Low Cooling Water Flow Rate
Check the cooling tower sump and cooling water circuit strainers.
Condenser/Absorber Fouling,
Scale Buildup
Check the cooling water circuit strainers. It may be necessary to drain the cooling water circuit
and open the inspection doors on the chiller-heater condenser and absorber for a visual
confirmation.
